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Vinay Kumar VemulaVinay Kumar Vemula 

Challenge Not yet complete... here's what's wrong: There was an unexpected error while verifying this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: YDUMURIN

SandhyaSandhya (Salesforce Developers) 
Hi,

If your challenge involves reports and dashboards, you may get this error when you have made some changes in report and did not refresh the dashboard.Try to refresh the dashboard and then check for challenge.
 
If this does not work for you, post the link of the challenge you are trying so that I can help you further.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya
SandhyaSandhya (Salesforce Developers) 
Refer below link where I have posted the answer

https://developer.salesforce.com/forums/?id=9060G0000005aQkQAI
 
Best Regards,
Sandhya
Vinay Kumar VemulaVinay Kumar Vemula

User-added image

I have checked in the formula fields which mentioned in above links, but still showing same error. 
error id: EPGJNXHD

Thanks,
Vinay

Vinay Kumar VemulaVinay Kumar Vemula

@Sandhya thanks fro your response.
I have cleared this step by creating again a new fresh Trailhead Playground and implemented same.
Erlier also I have used new TP. But I don't know why its throwed that error.
Thanks,
Vinay